package com.example.demo.web.interceptor;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.example.demo.web.Entity.UserEntity;


public class LoginInterceptor implements HandlerInterceptor {

	@Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
		//获取请求的RUi:去除http:localhost:8080这部分剩下的
        String uri = request.getRequestURI();
        
        //UTL:除了login.jsp是可以公开访问的，其他的URL都进行拦截控制
        if (uri.indexOf("static/") >= 0) {
            return true;
        }
        if (uri.indexOf("/login") >= 0) {
            return true;
        }
        if(uri.indexOf("mqtt") >= 0) {
        	return true;
        }
        //System.out.println("---------------------->>>>LoginInterceptor");
        //获取session
        HttpSession session = request.getSession();
        UserEntity user = (UserEntity) session.getAttribute("USER_SESSION");
        //判断session中是否有用户数据，如果有，则返回true，继续向下执行
        if (user != null) {
            return true;
        }
        //不符合条件的给出提示信息，并转发到登录页面
        request.setAttribute("msg", "您还没有登录，请先登录！");
        response.setHeader("sessionstatus", "timeout");
        request.getRequestDispatcher("login").forward(request, response);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        
    }
}
